Method and communication node for mapping an enhanced physical downlink control channel, EPDCCH, message

摘要

A method in a communication node for mapping symbols of an Enhanced Physical Downlink Control Channel, EPDCCH, message is provided. The EPDCCH comprises one or more aggregation levels. For each aggregation level, an EPDCCH message is constituted by a set of Control Channel Elements, eCCEs. Each eCCE is mapped to a set of multiple enhanced Resource Element Groups, eREGs, wherein each eREG is a group of Resource Elements, REs, in a Physical Resource Block, PRB, pair. The communication node maps the symbols of the EPDCCH message to the set of REs that constitutes the multiple eREGs that the set of eCCEs correspond to. The order in which the EPDCCH symbols are mapped to the set of REs is dependent on the aggregation level.

主权项

1. A method in a communication node for mapping symbols of an Enhanced Physical Downlink Control Channel (EPDCCH) message, which EPDCCH comprises one or more of at least two predefined aggregation levels, wherein for each predefined aggregation level an EPDCCH message is constituted by a set of Control Channel Elements (eCCEs), where each eCCE is mapped to a set of multiple enhanced Resource Element Groups (eREGs), wherein each eREG is a group of Resource Elements (REs) in a Physical Resource Block (PRB) pair, the method comprising:
mapping the symbols of the EPDCCH message to the set of REs that constitutes the multiple eREGs that the set of eCCEs correspond to, wherein the order in which the EPDCCH symbols are mapped to the set of REs is dependent on the aggregation level for the EPDCCH message, so that the mapping of the EPDCCH message enables the UE to detect the used aggregation level of the EPDCCH payload when received by the UE, wherein the mapping is performed by mapping the EPDCCH symbols in a subcarrier-first fashion over the eREGs of an EPDCCH set of PRB pairs, and then over time; and transmitting the mapped EPDCCH message to a user Equipment (UE).